sed

caution

• sed 一次只能操作一行

command	stand for
:	label
=	line_number
a	append_text_to_stdout_after_flush
b	branch_unconditional
c	range_change
d	pattern_delete_top/cycle
D	pattern_ltrunc(line+nl)_top/cycle
g	pattern=hold
G	pattern+=nl+hold
h	hold=pattern
H	hold+=nl+pattern
i	insert_text_to_stdout_now
l	pattern_list
n	pattern_flush=nextline_continue
N	pattern+=nl+nextline
p	pattern_print
P	pattern_first_line_print
q	flush_quit
r	append_file_to_stdout_after_flush
s	substitute
t	branch_on_substitute
w	append_pattern_to_file_now
x	swap_pattern_and_hold
y	transform_chars

• 参考
  • Command Summary for sed

sed '/pattern/d' file

# perl in place replace
# 可以 替换 \r\n - sed 不可以
# -i.bak 可生成备份文件
perl -ipe 's/\n//' file

替换片段

lead='^### BEGIN COMMON'
tail='^### END COMMON'
sed -e "/$lead/,/$tail/{ /$lead/{p; r stub/Makefile
}; /$tail/p; d }"  commons/Makefile